What Causes the Buzzing and Vibrating Sound in Car Air Conditioning?
2 Answers
When the car air conditioning is turned on and produces a buzzing sound, it may be due to the following reasons: 1. Air filter: A dirty air filter can cause excessive noise and abnormal sounds. 2. Blower fan blades: Debris inside the blower fan blades can lead to abnormal sounds. You can test this by turning on the blower without starting the engine to see if the sound occurs. If it does, the issue is likely with the blower. 3. Air conditioning fan: Deformed fan blades or a damaged fan motor in the car's air conditioning system. 4. Clutch bearing: Worn clutch bearings inside the air conditioning pump may cause the engine sound to become louder when the air conditioning is on. This component cannot be replaced separately and requires replacing the entire air conditioning pump assembly. 5. Loose screws: Vibrations may cause screws in the blower to loosen.
Last time I had my car repaired, I encountered a similar issue. The buzzing noise accompanied by vibrations was most likely caused by the air conditioning compressor. When the compressor runs for a long time, the bearings or screws inside may wear out, producing a buzzing sound. Alternatively, an unbalanced fan impeller can cause vibrations during operation. Also, if the belt is loose or worn, it can create noise due to friction. Insufficient refrigerant or leaks leading to abnormal system pressure might also trigger such noises. My suggestion is to first inspect the compressor—turn it on and listen. If the noise is loud and accompanied by noticeable vibrations, try tightening the screws or lubricating the bearings. For fan-related issues, check for any deformed blades. Examine the belt for signs of wear. If you can't handle it yourself, get it checked by a professional immediately to prevent more serious damage—replacing a compressor is much more troublesome. Remember, diagnosing AC noises early can save you a lot of money.
